Input And Output Characteristics Of Common Base Configuration Pdf


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25.01.2021 at 01:18
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input and output characteristics of common base configuration pdf

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The common emitter and common collector emitter follower configurations are far more widely used because their characteristics are generally more useful.

Definition : The configuration in which the emitter is connected between the collector and base is known as a common emitter configuration. The input circuit is connected between emitter and base, and the output circuit is taken from the collector and emitter. Thus, the emitter is common to both the input and the output circuit, and hence the name is the common emitter configuration.

Common Base Transistor Amplifier

Definition: The configuration in which the base of the transistor is common between emitter and collector circuit is called a common base configuration. In common base-emitter connection, the input is connected between emitter and base while the output is taken across collector and base. The ratio of output current to input current is known as a current amplification factor. In the common base configuration, the collector current I C is the output current, and the emitter current I E is the input current. Thus, the ratio of change in emitter current to the collector at constant collector-base voltage is known as a current amplification factor of a transistor in common base configuration. The value of current amplification factor is less than unity. The base current becomes zero only when it is thin and lightly doped.

Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. If you continue browsing the site, you agree to the use of cookies on this website. See our User Agreement and Privacy Policy. See our Privacy Policy and User Agreement for details. Published on May 26, A- Introduction B. T B- Position of the terminals and symbol of B.

In this transistor tutorial, we will learn about Different Configurations of Transistors. Since a Bipolar Junction Transistor is a 3-terminal device, there are three different configurations of Transistors possible with BJTs. Understanding these different configurations of transistors will help you in better implementation of your application. We know that generally the transistor has three terminals — emitter E , base B and collector. But in the circuit connections we need four terminals, two terminals for input and another two terminals for output. To overcome these problems we use one terminal as common for both input and output actions.

Common Base Transistor Amplifier

In common base configuration, emitter is the input terminal, collector is the output terminal and base terminal is connected as a common terminal for both input and output. That means the emitter terminal and common base terminal are known as input terminals whereas the collector terminal and common base terminal are known as output terminals. In common base configuration, the base terminal is grounded so the common base configuration is also known as grounded base configuration. Sometimes common base configuration is referred to as common base amplifier, CB amplifier, or CB configuration. The input signal is applied between the emitter and base terminals while the corresponding output signal is taken across the collector and base terminals. Thus the base terminal of a transistor is common for both input and output terminals and hence it is named as common base configuration.

Now in this article, we see common base configuration of transistor, equations for common base transistor and input and output characteristics of a common base transistor. In previous we see the different connection of the transistor. The transistor can be connected in a circuit with three basic connection. As we know transistor can be connected in a circuit in a different way as per their requirement. Each transistor circuit configuration has some advantages and disadvantages. But in every configuration emitter base junction is in forward bias and base collector junction is in reverse bias.

In electronics , a common-base also known as grounded-base amplifier is one of three basic single-stage bipolar junction transistor BJT amplifier topologies, typically used as a current buffer or voltage amplifier. In this circuit the emitter terminal of the transistor serves as the input, the collector as the output, and the base is connected to ground, or "common", hence its name. The analogous field-effect transistor circuit is the common-gate amplifier. As current is sunk from the emitter, this provides potential difference so causing the transistor to conduct. The current conducted via the collector is proportional to the voltage across the base—emitter junction, accounting for the bias, as with other configurations.

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Different Configurations of Transistors

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Common base configuration | input and output characteristics & equation

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